Desktop aura: Break aura::Window::SetParent in two.

content/browser/web_contents/web_contents_view_aura.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/auto_reset.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/renderer_host/dip_util.h"
 #include "content/browser/renderer_host/overscroll_controller.h"
@@ skipping 481 matching lines @@
 void WebContentsViewAura::CreateView(const gfx::Size& initial_size) {
   // NOTE: we ignore |initial_size| since in some cases it's wrong (such as
   // if the bookmark bar is not shown and you create a new tab). The right
   // value is set shortly after this, so its safe to ignore.
 
   window_.reset(new aura::Window(this));
   window_->set_owned_by_parent(false);
   window_->SetType(aura::client::WINDOW_TYPE_CONTROL);
   window_->SetTransparent(false);
   window_->Init(ui::LAYER_NOT_DRAWN);
-  window_->SetParent(NULL);
+  // TODO(erg): Do something else here later.
+  window_->SetDefaultParentByTargetRoot(NULL, gfx::Rect());
   window_->layer()->SetMasksToBounds(true);
   window_->SetName("WebContentsViewAura");
 
   window_observer_.reset(new WindowObserver(this));
   window_->AddObserver(window_observer_.get());
 
   // delegate_->GetDragDestDelegate() creates a new delegate on every call.
   // Hence, we save a reference to it locally. Similar model is used on other
   // platforms as well.
   if (delegate_.get())
@@ skipping 467 matching lines @@
       event.location(),
       gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
   if (drag_dest_delegate_)
     drag_dest_delegate_->OnDrop();
   current_drop_data_.reset();
   return current_drag_op_;
 }
 
 }  // namespace content